Blender keeps flickering

A while back I downloaded the newest version of blender to my Mac, but since I couldn’t get used to it, I downloaded 2.49b and it keeps flickering. Is there a way to stop this?

What are your hardware specs? What kind of mac do you have? Did you switch/update to a newer Mac Os? Do you have an intel-only video chip?

…but try sticking with the newest version - it might be different from 2.49 (though not that much): you are missing out on all the new features.